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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui/qplaintextedit.h>
#include <QtGui/qtextedit.h>
#include <QtGui/qabstractkineticscroller.h>
#include <QtGui/qscrollarea.h>
#include <QtDebug>
#ifndef TEXTEDITAUTORESIZER_H
#define TEXTEDITAUTORESIZER_H
class TextEditAutoResizer : public QObject
{
Q_OBJECT
public:
TextEditAutoResizer(QWidget *parent)
: QObject(parent), plainTextEdit(qobject_cast<QPlainTextEdit *>(parent)),
textEdit(qobject_cast<QTextEdit *>(parent)), edit(qobject_cast<QFrame *>(parent))
{
// parent must either inherit QPlainTextEdit or QTextEdit!
Q_ASSERT(plainTextEdit || textEdit);
connect(parent, SIGNAL(textChanged()), this, SLOT(textEditChanged()));
connect(parent, SIGNAL(cursorPositionChanged()), this, SLOT(textEditChanged()));
textEditChanged();
}
private Q_SLOTS:
inline void textEditChanged();
private:
QPlainTextEdit *plainTextEdit;
QTextEdit *textEdit;
QFrame *edit;
};
void TextEditAutoResizer::textEditChanged()
{
QTextDocument *doc = textEdit ? textEdit->document() : plainTextEdit->document();
QRect cursor = textEdit ? textEdit->cursorRect() : plainTextEdit->cursorRect();
QSize s = doc->size().toSize();
if (plainTextEdit)
s.setHeight((s.height() + 2) * edit->fontMetrics().lineSpacing());
const QRect fr = edit->frameRect();
const QRect cr = edit->contentsRect();
edit->setMinimumHeight(qMax(70, s.height() + (fr.height() - cr.height() - 1)));
// make sure the cursor is visible in case we have a QAbstractScrollArea parent
QPoint pos = edit->pos();
QWidget *pw = edit->parentWidget();
while (pw) {
if (qobject_cast<QScrollArea *>(pw))
break;
pw = pw->parentWidget();
}
if (pw) {
QScrollArea *area = static_cast<QScrollArea *>(pw);
QPoint scrollto = area->widget()->mapFrom(edit, cursor.center());
QPoint margin(10 + cursor.width(), 2 * cursor.height());
if (QAbstractKineticScroller *scroller = area->property("kineticScroller").value<QAbstractKineticScroller *>()) {
scroller->ensureVisible(scrollto, margin.x(), margin.y());
} else {
area->ensureVisible(scrollto.x(), scrollto.y(), margin.x(), margin.y());
}
}
}
#endif
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